LP3991TL-1.3EV

User's Guide SNVA134B – February 2007 – Revised April 2013 AN-1416 LP3991TL DSBGA Evaluation Board Information 1 Introduction This board is designed to allow the evaluation of the LP3991 low voltage CMOS regulator. Each board is pre-assembled and tested in the factory. The board contains the LP3991 in a 4 bump DSBGA package and input and output capacitors connected to GND . The LP3991 is capable of operating with an input voltage as low as 1.65 V for output voltage options of 1.5 V or less. The LP3991 can supply a maximum output current of 300 mA and is particularly suitable for powering digital circuits, where good transient behavior is required. It can be employed in applications requiring post regulation of switching regulators to provide maximum efficiency in battery powered products. 2 Operation The input voltage, applied between VIN and GND should be at least 0.5 V above the output voltage with a minimum of 1.65 V and a maximum of 3.3 V. For output voltages of 1.5 V or higher, the LP3991 will operate with an input voltage of only 0.2 V above VOUT. However, some loss in performance of PSSR and transient behavior can be expected when operating the device with such a low VIN to VOUT difference. Input connections should be kept reasonably short (